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florian239955_st
florian239955_st
Associate III
March 2, 2018
Question

SPWF04: Need a pull down at RTS

  • March 2, 2018
  • 2 replies
  • 773 views
Posted on March 02, 2018 at 16:34

Hi,

I changed on my hardware the SPWF01 against a SPWF04 module. I communicate with the module via a STM32. If I use the SPWF04 module, I need a pull down resistor at the SPWF RTS output to get the communication working. I wonder why? Any ideas?

BR,

Flow

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    2 replies

    Tia Meng
    Tia Meng
    Associate
    April 2, 2018
    Posted on April 03, 2018 at 01:10

    We have a customer using 

    SPWF04 recently and found this module when running at standby mode would draw around >1mA current rather than uA level mentioned in the datasheet. They were using SPWF01 before and did not see this problem. May I know if SPWF04 could be a compatible replacement for SPWF01, any notice/tips for Hardware redesign or AT comment settings? I have asked them to pull down some GPIO externally e.g. GPIO7,8,9, but standby current is mA.  Thanks. 

    Elio Cometti
    Elio Cometti
    Visitor II
    April 4, 2018
    Posted on April 04, 2018 at 11:26

    Hello Flow,

    the SPWF RTS output is not driven when HW flow control is disabled (console_hwfc=0).

    Please verify the HW flow control is enabled on both SPWF and host micro, or HW flow control is disabled on both SPWF and host micro.

    Regards,

    Elio

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